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Fig.2. Effect of larval presence on amount of urea in food. Experimental groups consisted of vials containing either selected larvae, or control larvae or no larvae. 40 larvae were reared in exactly 2ml of urea food per vial. Food was assayed for urea content after larvae pupated, about 1 week later. Values are means ± 1 S.D., N=5 populations per each experimental group.
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